cmake LibRT examples

fzi-forschungszentrum-informatik/gpu-voxels packages/gpu_voxels/CMakeLists.txt :19 

FIND_PACKAGE(LibRt)

google/filament third_party/civetweb/src/CMakeLists.txt :43 

find_package(LibRt)

ElektraInitiative/libelektra src/tools/race/CMakeLists.txt :2 

find_package (LibRt QUIET)

swiftlang/swift-corelibs-foundation CMakeLists.txt :157 

find_package(LibRT)

NCAR/ParallelIO src/gptl/CMakeLists.txt :95 

find_package (LIBRT)

swiftlang/swift-corelibs-libdispatch CMakeLists.txt :182 

find_package(LibRT)